A user can then play and download MP3s and AACs music files.

If ourTunes doesn't see any hosts, make sure you're not on a wireless network, that seems to give it some trouble. If that doesn't fix it, we're sorry, we're working on it.

You need to be on a network with other people who have iTunes sharing turned on for ourTunes to be at all useful
The search box is not enabled unless ourTunes sees at least one host
As for updates ... we're swamped with work this quarter and probably won't be updating OT until mid-december ... this means passworded hosts are on hold for now .. We're also going to be really bad about responding to emails .. sorry, sorry
If you want to look at the ourTunes source, download the .jar and unzip it, either with the "jar" program that comes bundled with java, or rename it to a .zip and just use a standard unzip program. All the source files are in there.

What's New:

More consistent UI
The "Play" button works again
Slightly better memory management
Some tweeks for faster searching
You can now pause connecting.